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首页> 外文期刊>Separation and Purification Technology >Amine extraction of chromium(VI) from aqueous acidic solutions
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Amine extraction of chromium(VI) from aqueous acidic solutions

机译：从酸性水溶液中胺萃取六价铬

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摘要

Extraction of chromium (Cr(VI)) from the aqueous acidic solution into a co-existing organic phase containing Alamine 336 (C_8-C_(10) tertiary amine mixture) and diluent (xylene) was studied at isothermal condition (298.12K).The distribution ratio was measured for two initial aqueous concentrations of Cr(VI),i.e.0.019 mol/dm~3 (1 mg/ml) and 0.192 mol/dm~3 (10 mg/ml) against various molarities of the aqueous phase sulphuric acid in the range from 0.05 to 4 mol/dm~3.The overall loading factor of amine (Z_t) exhibits a maximum restricted between the aqueous phase acidity of 0.75-1 mol/dm~3 H_2SO_4 for a lower amine concentration related to the ratio of initial concentrations of amine to Cr(VI),C_(NH_3)/C_(Cr(VI)) approx=0.75 or less than this limit.In the range above this value a continual decreasing of Z_t has been observed.A comparative study of the extraction degrees of Cr(VI) by Alamine 336 and Aliquat 336 extractants for the pH range of 1-7 has been evaluated.The results were correlated using various versions of the mass action law,i.e.a chemodel approach and a modified version of the Langmuir equilibrium model comprising the formation of only one type Cr(VI)-amine aggregated structure.
机译：在等温条件下（298.12K）研究了将铬（Cr（VI））从酸性水溶液中萃取到含有Alamine 336（C_8-C_（10）叔胺混合物）和稀释剂（二甲苯）的共存有机相中的方法。测量了两种初始浓度的Cr（VI）相对于不同摩尔浓度的水相硫酸的0.019 mol / dm〜3（1 mg / ml）和0.192 mol / dm〜3（10 mg / ml）的分配比。酸的范围在0.05至4 mol / dm〜3之间。对于较低的胺浓度，胺的总负载率（Z_t）在0.75-1 mol / dm〜3 H_2SO_4的水相酸度之间表现出最大限制。胺与Cr（VI）的初始浓度之比，C_（NH_3）/ C_（Cr（VI））约等于或小于此极限0.75。在该值以上的范围内，观察到Z_t连续降低。评估了Alamine 336和Aliquat 336萃取剂在1-7的pH范围内对Cr（VI）的萃取度的研究。使用各种形式的质量作用定律（即化学模型方法）和Langmuir平衡模型的修改版本（仅包含一种Cr（VI）-胺类聚集结构的形成）。

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